2010 WG9

2010 WG9
Discovery [1]
Discovered by LaSilla–Quest Variability Srvy.
Discovery site La Silla Observatory
Discovery date 30 November 2010
(discovery: first observation only)
Designations
MPC designation 2010 WG9
TNO [1] · centaur · distant [2]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 3
Observation arc 6.22 yr (2,271 days)
Aphelion 87.037 AU
Perihelion 18.765 AU
52.901 AU
Eccentricity 0.6453
384.77 yr (140,538 days)
10.821°
0° 0m 9.36s / day
Inclination 70.331°
92.065°
293.00°
Physical characteristics
Dimensions 100.81 km (calculated)[3]
112.7±61.9 km[4]
263.8±0.1 h[5]
0.074±0.080[4]
0.10 (assumed)[3]
BR = 1.10[6]
B–V = 0.798±0.034[5]
V–R = 0.520±0.018[5]
8.1[1][3]

    2010 WG9 is a high inclination trans-Neptunian object and slow rotator from the outer Solar System, approximately 100 kilometers in diameter.[1] It was first observed at ESO's La Silla Observatory in northern Chile on 30 November 2010.[2]

    Orbit and classification

    2010 WG9 orbits the Sun at a distance of 18.8–87.0 AU once every 384 years and 9 months (140,538 days). Its orbit has an eccentricity of 0.65 and an inclination of 70° with respect to the ecliptic.[1]

    As of July 2017, it is one of 7 known objects with inclination (i) > 60° and perihelion (q) > 15 AU, along with the first discovered 2008 KV42.[7]

    Physical characteristics

    Rotation period

    A rotational lightcurve of 2010 WG9 was obtained from photometric observations by the LaSilla–Quest Variability Survey at La Silla in Chile. Lightcurve analysis gave a rotation period of 263.8 hours with a brightness amplitude of 0.14 magnitude (U=2).[5] It belongs to the Top 200 slowest rotators known to exist.

    Diameter and albedo

    It measures 112.7 kilometers in diameter and its surface has an albedo of 0.074.[4] The Collaborative Asteroid Lightcurve Link assumes a standard albedo of 0.10 and calculates a diameter of 100.81 kilometers based on an absolute magnitude of 8.1.[3]

    References

    1. 1 2 3 4 5 6 "JPL Small-Body Database Browser: (2010 WG9)" (2016-03-13 last obs.). Jet Propulsion Laboratory. Retrieved 25 July 2017.
    2. 1 2 "2010 WG9". Minor Planet Center. Retrieved 25 July 2017.
    3. 1 2 3 4 "LCDB Data for (2010)". Asteroid Lightcurve Database (LCDB). Retrieved 25 July 2017.
    4. 1 2 3 Bauer, James M.; Grav, Tommy; Blauvelt, Erin; Mainzer, A. K.; Masiero, Joseph R.; Stevenson, Rachel; et al. (August 2013). "Centaurs and Scattered Disk Objects in the Thermal Infrared: Analysis of WISE/NEOWISE Observations". The Astrophysical Journal. 773 (1): 11. arXiv:1306.1862. Bibcode:2013ApJ...773...22B. doi:10.1088/0004-637X/773/1/22. Retrieved 25 July 2017.
    5. 1 2 3 4 Rabinowitz, David; Schwamb, Megan E.; Hadjiyska, Elena; Tourtellotte, Suzanne; Rojo, Patricio (July 2013). "The Peculiar Photometric Properties of 2010 WG9: A Slowly Rotating Trans-Neptunian Object from the Oort Cloud" (PDF). The Astronomical Journal. 146 (1): 10. arXiv:1305.5134. Bibcode:2013AJ....146...17R. doi:10.1088/0004-6256/146/1/17. Retrieved 25 July 2017.
    6. ↑ "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 26 July 2017.
    7. ↑ "Custom query: i = 60 and q = 15+". Minor Planet Center. Retrieved 26 July 2017.

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